Multi-Dose Vehicle X-Ray Scanning for Driver Safety
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Solution Overview
Problem
Conventional X-ray vehicle check systems face challenges in ensuring driver safety during scanning, as high-dose X-rays required for effective imaging result in excessive radiation exposure, particularly when scanning vehicles like vans and buses where the cab is close to the rear carriage, leading to incomplete scanning and safety risks.
Innovation Solution
A quick vehicle check system employing multi-dose regional scanning, which uses a low-dose X-ray initially and switches to a high-dose X-ray after the cab has passed a predetermined distance, ensuring safe radiation levels for the driver by adjusting the dose rates and scanning regions dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-dose X-ray scanning is used to ensure penetration power and image quality, then imaging quality is improved, but driver radiation exposure exceeds safe limits
Solution Approach 1:
The vehicle is divided into two regions: cab region and cargo region. The system applies different X-ray dose rates to different regions by detecting the cab's position and controlling the radiation source to emit low-dose X-rays when the cab is in the scanning region and high-dose X-rays when only the cargo region remains. This segmentation resolves the contradiction by allowing high-dose scanning for image quality where needed while protecting the driver in the cab region.
Solution Approach 2:
Different parts of the vehicle receive different X-ray dose rates based on their location and occupancy. The cab region receives low-dose X-rays to protect the driver, while the cargo region receives high-dose X-rays to ensure penetration power and image quality. This local quality approach allows the system to optimize imaging quality in the cargo region without exposing the driver to excessive radiation.
2Object-affected harmful factors
If the scanning starts at a safe distance behind the cab to avoid excessive radiation dose, then driver safety is improved, but scanning coverage is reduced for vehicles with compact designs
Solution Approach 1:
The system dynamically adjusts the X-ray dose rate based on the real-time position of the vehicle cab relative to the scanning region. By detecting the cab's position and continuously adjusting the radiation source output, the system can switch between low-dose and high-dose modes, enabling complete scanning coverage from the rear end of the vehicle to the cab while maintaining driver safety. This dynamic adjustment resolves the contradiction by eliminating the need for a fixed safe distance offset.
3Object-affected harmful factors
If low-dose X-ray is used to ensure driver safety, then radiation security is improved, but penetration power and image quality deteriorate
Solution Approach 1:
The system changes the X-ray dose rate parameter based on the scanning region and driver position. When the cab is detected in the scanning region, the system switches to low-dose mode to protect the driver. When the cab has passed and only the cargo region remains, the system switches to high-dose mode to ensure sufficient penetration power and image quality. This parameter change strategy resolves the contradiction by optimizing the dose rate for each specific scanning scenario.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for comprehensive scanning of vehicles without exceeding safe radiation limits for the driver, maintaining image quality and safety, especially in scenarios where vehicles have compact designs like vans and buses, thereby enhancing security and efficiency in customs and border checks.
Implementation Method 1
the radiation source generates high-energy X-ray pulses transmitting the checked goods, and an array of high-sensitivity detectors receives X-rays and converts them into output signal
Implementation Method 2
an array of high-sensitivity detectors receives X-rays and converts them into output signal
Implementation Method 3
the out-of-limit X-ray dose for the driver which is caused by the scattering generated during high-dose X-ray scanning of the radiation source
Data Source
Figure 1
Figure 2a
Figure 2b~3a
AI summary
A quick vehicle check system comprises a radiation source which produces a first X ray with a first dose and a second X ray with a second dose, wherein the first dose is smaller than the second dose, and the first X ray is used for checking a first part of a checked vehicle and the second X ray is used for checking a second part of the checked vehicle; a first sensor for detecting a set position of the checked vehicle; a second sensor for detecting a passing distance of the checked vehicle; and a control unit coupled with the first sensor and the second sensor, which receives the set position of the checked vehicle from the first sensor and receives the passing distance of the checked vehicle from the second sensor, and when it is determined that the set position of the checked vehicle reaches a scanning region, the control unit informs the radiation source to emit the first X ray; and when the passing distance of the checked vehicle reaches the preset distance, the control unit informs the radiation source to emit the second X ray so as to scan the second part.